San Julián de los Prados, also known as Santullano, is a Pre-Ramirense church from the beginning of the 9th century in Oviedo, the capital city of the Principality of Asturias, Spain.

It is one of the greatest works of Asturian art and was declared an Historical-Artistic Monument by the Spanish Ministry of Culture in June 1917 and a World Heritage Site by UNESCO on 2 December 1998.

It is of basilican plan with a nave and two aisles separated by square piers which support semi-circular arches and with a transept of impressive height.

The iconostasis, that separates the sanctuary from the rest of the church is remarkably similar in appearance to a triumphal arch.

There are also two marble flagstones with hexagonal geometric figures and floral motives that are found in the central chapel.